(北京航空航天大学 材料科学与工程学院，北京 100191)
摘 要: 通过表面形貌观察、升压曲线测试、电化学阻抗谱(EIS)测试和疲劳性能测试等研究LY12铝合金铬酸阳极氧化(CAA)、硼酸−硫酸阳极氧化(BSAA)和己二酸−硫酸阳极氧化(ASAA)膜的性能。结果表明：CAA膜和 ASAA膜缺陷较少且缺陷边缘光滑，BSAA膜缺陷数目较多且边缘较为粗糙。3种氧化膜的耐蚀性良好，在5% NaCl(质量分数)溶液中浸泡80 d后，均未出现明显的破坏。对比氧化膜的壁垒层阻抗(Rb)发现，BSAA的Rb值下降最大，约为94%，CAA和ASAA优于前者，其阻抗分别下降了75%和78%。3种阳极氧化技术对基体疲劳性能的影响结果表明，CAA处理降低基体的疲劳寿命值最小，约为14%；ASAA次之，约为20%；BSAA对基本疲劳性能的影响最大，约25%。
关键字: LY12铝合金；阳极氧化膜；铬酸阳极氧化；硼酸−硫酸阳极氧化；己二酸−硫酸阳极氧化
（School of Materials Science and Engineering, Beihang University, Beijing 100191, China）
Abstract:The properties of anodic films formed in chromic, boric-sulfuric and adipic-sulfuric acid (CAA, BSAA and ASAA, respectively) on LY12 aluminum alloy were studied by morphology characterization, current-voltage response test, electrochemical impedance spectroscopy (EIS) and fatigue test methods. It is indicated that in contrast with BSAA film, CAA and ASAA films have less defects and a smoother periphery. All of three kinds of anodic films have perfect corrosion resistant after immersed in 5% NaCl solution for 80 d. The resistance value (Rb) of the barrier layers of BSAA decreases in greatest, while the Rb values of CAA and ASAA decrease by 75% and 78%, respectively. From fatigue test results, it is confirmed that CAA reduces the fatigue life of the matrix at a little, about 14%, ASAA, about 20%, and BSAA about 25%, indicating that BSAA has the greatest impact on the fatigue life of the matrix among the three treatments.
Key words: LY12 aluminum alloy; anodic films; chromic acid anodization; boric-sulfuric acid anodization; adipic- sulfuric acid anodization
